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United States Patent | 5,117,547 |
Boski | June 2, 1992 |
A heat releasable weldment for a mechanical opening jack used in combination with fluid powered valve actuators to release said manual opening jack in the event of fire comprising grooved inner and outer members which cooperate to form a eutectic chamber, said inner and said outer members being retained in spaced relationship with each other by horizontal and vertical restraining members in cooperation with a fusable eutectic alloy which is poured into said eutectic chamber and allowed to solidify together and a method to field retrofit said weldment to a mechanical opening jack is presented.
Inventors: | Boski; Israel (Plano, TX) |
Assignee: | Otis Engineering Corporation (Dallas, TX) |
Appl. No.: | 649325 |
Filed: | January 31, 1991 |
Current U.S. Class: | 29/401.1; 29/402.01 |
Intern'l Class: | B21K 021/16; B23P 017/04; B23P 023/00 |
Field of Search: | 29/401.1,402.08,402.01,402.03 137/72,75,77 |
3842854 | Oct., 1974 | Wicke | 237/77. |
4240455 | Dec., 1980 | McGee | 137/77. |
4421134 | Dec., 1983 | Bruton et al. | 137/72. |
4934652 | Jun., 1990 | Golden | 251/63. |